Sharpen

Sharpen is a function typically used to increase the visual sharpness of an image, i.e. to remove blurring and increase the focus of blurry regions. It therefore enhances local details (including edges) of an image.

Sharpen implements unsharp masking, which combines a high-frequency version of the image with the original in order to add details. Sharpen is a linear operation, meaning its application to a linear combination of images is equivalent to a linear combination of the images obtained by applying it individually.

ImageDeconvolve provides finer control over the sharpening by allowing specification of the “shape” of the blur, known as the point spread function. The converse operation to Sharpen is Blur.